"I'm one of the few people who seem to have had a really good first time," he reveals. "It was with somebody I’d gotten to know well. I'm happy to say I've had a lot better sex since then, but it wasn't as horrendously embarrassing as a lot of other people's were -- like my friend who got drunk and did it with a stranger under a bridge."

Radcliffe, who's been open about struggling with alcohol abuse in the past and quit drinking in 2010, also says that being intimate is much better for him these days.

"For some people sex might be better drunk, but for me -- and the person I'm doing it with -- it's much better sober," he admits.

Currently, all seems to be going well in Radcliffe's love life -- he's dating actress Erin Darke, whom he reportedly met on the set of 2013's "Kill Your Darlings" -- and reveals that she actually got him hooked on Bravo's "Millionaire Matchmaker!"

"It's unbelievably compulsive television," he explains. "I know the men on there get told nothing but wonderful things about themselves all the time. But I watch them, and I'm like, 'How are you speaking to a woman like this?!'"